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In 1471, Christopher Columbus was just about to discover America when a cow in the cargo hold knocked over a lantern and set fire to the ship. That, or we’ve confused two anniversaries. At 10:30 a.m. Saturday, “The Great Chicago Fire” tour visits Mrs. O’Leary’s 1871 home site, plus the Water Tower and the Chicago Historical Society’s fire exhibit. Tickets are $56 ($53 for seniors and kids). 312-742-1190. At 1 p.m. Monday, the annual Columbus Day Parade celebrates old Chris’ famous (and infamous) 1492 voyage. The route begins at Monroe Street and Columbus Drive. Free. 312-828-0010.

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